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Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Technician (only for users in the US for now) and get all the help you need. Goodluck!

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Voice command must be enabled. To use the phone through this device you must enable BlueTooth and pair the device with your phone. When you say it is turning off, it may be just dimming the display as a way to save power. Please do read the manual.
Here is a link.http://static.garmincdn.com/pumac/nuvi_3500_OM_EN.pdf

Make sure that the tyres on each side of the vehicle are of the same type of tread, and the same size and the same tread depth. All of these can cause "self steering".

If these aren't an issue, then check the track rod ends for play (wear)

If these are okay, then also check the steering rack mountings for play. There are rubber mounts and brackets which locate this. Sometimes they work loose on some models, or the rubber mountings can perish and/or wear out.

Check all speaker wires for shorts as this can shut down the receiver. The end may protrude too far into the chassis and touch the metal frame, this could cause a short. Try disconnecting one speaker at atime to eliminate a bad one.....

You have a leak due to the Lid seal leak.1- Unplug the power, then pull out top draw half way and 2-Touch the bottom top housing ( not bottom top draw) you will feel it wet. Try to dry it by stick in a towel.3- Repeat the same for the bottom drawer.After drying out, wait for at least 1 day so the sensor can be dried out then plug in the Power, you will be fine.4- Contact me for the next step.